Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Narrative) (Details)

v2.4.1.9
Shareholders' Equity (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended 34 Months Ended
Mar. 25, 2015
Feb. 19, 2015
Mar. 19, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jul. 31, 2014
Sep. 27, 2011
Jan. 27, 2015
Share Repurchase Program [Line Items]                  
Share repurchased and retired       118,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 27,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares        
Value of shares repurchased and retired       $ 7,900,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue $ 1,500,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   $ 451,000,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue    
Outstanding common stock acquired, average price       $ 66.70us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 54.10us-gaap_TreasuryStockAcquiredAverageCostPerShare   $ 45.10us-gaap_TreasuryStockAcquiredAverageCostPerShare    
Dividends, Common Stock, Cash $ 18,400,000us-gaap_DividendsCommonStockCash $ 524,300,000us-gaap_DividendsCommonStockCash $ 13,300,000us-gaap_DividendsCommonStockCash $ 542,748,000us-gaap_DividendsCommonStockCash   $ 57,824,000us-gaap_DividendsCommonStockCash      
Common Stock, Dividends, Per Share, Cash Paid $ 0.35us-gaap_CommonStockDividendsPerShareCashPaid $ 10.00us-gaap_CommonStockDividendsPerShareCashPaid $ 0.25us-gaap_CommonStockDividendsPerShareCashPaid            
10 Million Share Program Approved 9/27/2011 [Member]                  
Share Repurchase Program [Line Items]                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased               10,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_ShareRepurchaseProgramAxis
= hsni_A10MillionShareProgramApproved9272011Member
 
4 Million Share Program Approved 1/27/2015 [Member]                  
Share Repurchase Program [Line Items]                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                 4,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_ShareRepurchaseProgramAxis
= hsni_A4MillionShareProgramApproved1272015Member